3 results about "Methyl Viologen" patented technology

This invention belongs to the field of fuel cell technology and discloses a methyl viologen-dopamine polymer enzyme-mimicking catalytic electrode, its preparation method, and its application in glucose fuel cells. The methyl viologen-dopamine polymer enzyme-mimicking catalytic electrode was prepared using a continuous cyclic voltammetry-driven methyl viologen-dopamine redox co-assembly method. The preparation method is simple and allows for easy control of deposition amount and degree of polymerization. The prepared electrode not only exhibits outstanding glucose oxidase-mimicking activity for glucose oxidation but also demonstrates good electrocatalytic activity for oxygen reduction. Glucose fuel cells assembled using methyl viologen-dopamine polymer as both anode and cathode catalysts exhibit high open-circuit voltage and power density. The assembled fuel cells do not require precious metal catalysts or enzyme catalysts, and are characterized by simple operation, environmental friendliness, safety, and high efficiency.

This invention discloses a polymeric flow battery cathode material and its preparation method. The polymeric flow battery cathode material is a TEMPO polymer, which includes the structure shown in Formula I, as well as the structures shown in Formula II and / or Formula III. By using TEMPO polymer as the cathode material and methyl viologen or its derivatives as the anode material, this invention yields a polymeric flow battery with outstanding advantages such as high stability, good safety, flexible configuration, fast response, environmental friendliness, high capacity, and stable charge-discharge performance, providing strong support for the application of large-scale energy storage technology.

The application discloses a method for improving stability of TEMPO-MV organic flow battery, and belongs to the technical field of electrochemical energy storage. The application is aimed at the core problem that protons produced by TEMPO decomposition in the cycle of the battery are migrated to the negative electrode, which causes irreversible degradation of methyl viologen (MV) active material and leads to capacity attenuation, and proposes functional modification of the negative electrode; a metal with low hydrogen evolution overpotential is loaded on the negative electrode porous carbon-based electrode as a catalyst; the modified electrode can preferentially adsorb and catalyze the hydrogen evolution reaction of the protons migrated to the negative electrode, and timely discharge the protons in the form of hydrogen, so as to stabilize the local chemical environment of the negative electrode and cut off the degradation path of the active material induced by the protons; after being modified by the method, the capacity attenuation rate of the battery under the working condition of the strong acid positive electrolyte can be reduced from 0.036% / cycle to zero attenuation, and the decomposition rate of the negative electrode MV can be reduced from 8.8% to 1.9%; the method can significantly improve the cycle life and capacity retention rate of the battery, while maintaining good power performance.